Fun With Words / Word Playhttp://www.fun-with-words.com/index.html
Logic Puzzleshttp://www.puzzlersparadise.com/index.html
Plexershttp://kids.niehs.nih.gov/braintpics.htm
Brain Pophttp://www.brainpop.com/
Lots of educational videos on just about everything!

Yahoo! Kidshttp://kids.yahoo.com/
The Web guide for kids. Check out news, games, jokes, and more!

Funschool.com
http://www.funschool.com/
Educational games